Simple suggestion. Brandish and it's upgrades does too much damage on it's swings. FoV is slower than brandish yet does less damage. I'm not suggesting to nerf brandish down to cutter levels. Just something that brings it's damage in line with other swords and the FoV. Perhaps a decrease of around 80 damage for brandishes at d28, and a boost of about 40 damage orthe equivalent of an ASI High UV for FoV.
Discuss.
Just so other readers don't have to do this digging, I'll lay out my research on the matter.
Leviathan Blade / Final Flourish at depth 28 (first swing): 285 effective, 193 neutral
Combuster at depth 28 (first swing): 292 effective, 203 neutral
Fang of Vog at depth 28 (first swing): 266 effective, 183 neutral
Do your number tweaks represent individual swings or the full combo? If individual swings, we get quite the powershift going on:
Leviathan Blade/Final Flourish: 285 effective, 193 neutral
Combuster: 212 effective, 123 neutral
Fang of Vog: 306 effective, 223 neutral
I don't personally mind Combuster's effective damage being barely above Levi's neutral damage, as the status potential more than make up for it, but it leaves Flourish as being blatantly overpowered in comparison, and if you boost FoV in addition to nerfing Combuster it simply becomes too powerful. FoV already has an intensly damaging charge attack going for it, in addition to essentially being free. (30k for a 5* weapons is nothing.)
Acheron also doesn't have a status and should perhaps receive a milder nerf.